多媒体技术是当今计算机领域一个十分活跃的热点。本文主要研究把多媒体技术引进监控领域从而改善现有的报警形式。我们提出了多媒体声频监控系统的结构，并在运用小波分析等数字信号处理算法的基础上达到了对声音（特别是周期性声音）的变化进行同步声频报警的监控目的。 Multimedia technology is a very active hot spot in the computer field today. This article focuses on the introduction of multimedia technology into the field of monitoring to improve the existing alarm form. We propose the structure of the multimedia audio monitoring system and achieve the purpose of monitoring the synchronization of the audio alarm with the change of the sound (especially the periodic sound) based on the digital signal processing algorithms such as wavelet analysis.